Master IC: AC6926 Bluetooth IC: AC6926 Bluetooth version is version 5.0 Music format: MP3 / WMA / WAV / APE lossless format Radio FM frequency: 87.5-107.5 MHZ Support function introduction: support MP3 / USB / TF / LINE IN / FM / BLUETOOTH / remote remote connection / DC 5V or 12V (optional) 1 LED: digital screen display, display red, color screen display; 2 USB: Connect U disk (maximum support 32GB,not included) 3 VOL-: Short is to select the previous song; long is to decrease the volume 4 PLAY/PAUSE: Short is the switch between pause and play; short in the FM FM state is automatic 5 VOL+: Short is to select song; long is to increase the volume 6 MODE: USB / TF / FM / AUX / BLUETOOTH tone switching 7 TF: Connect TF memory card (maximum support 32GB,not included) 8 Infrared receiving module Colour: Black Material: plastic + metal Package contents: 1* decoder board 1* remote control Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.